Hoping you was going to reply! lol
Yes, big mystery for sure.. Never seen anything like it! The car is a daily and no garage so it sits outside all the time. It does not see any auto car washes, it gets washed properly. No different than our trucks and they don't react this way. We live in South Louisiana in a rural area.
A dealer installed paint protection is what I keep saying, something is not playing well together. But I figured any dealer applied protection would be removed with the 1 step correction.
We have a game plan of completely decontaminating it; Iron remover, clay, 1 step polish, alcohol wipe down & then reapply whichever product he wants and see where it goes from there. May have to branch out to the coating world..